Burglar-alarm.



No. 830,038. PATENTED SEPT. 4, 1906.' H. P. ALBURGER.

BURGLAR ALARM.

APPLICATION FILED 001s. 190s.

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BURGLAR-ALARM.

Specification of Letters Patent.

Patented Sept. 4, 1906.

Application filed October 3,1905. Serial No. 281,114.

To all whom, it may concern:

Be it known that I, I'TALLIE F. ALBURGER, a citizen of the UnitedStates, residing at Colwyn, county of Delaware, and State ofPennsylvania, have invented a certain new and useful Improvement inBurglar-Alarms, of which the following is a specification.

My invention relates to a new and useful improvement in burglar-alarms,and has for its object to provide a simple and effective device of thisdescription which may be readily applied to a door or window in such amanner that when an attempt is made to open said door or window acartridge will be exploded, thereby frightening the intruder andalarming the occupants of the building.

l/Vith these ends in view this invention con sists in the details ofconstruction and com bination of elements hereinafter set forthand thenspecifically designated by the claim.

In order that those skilled in the art to which this inventionappertains may understand how to make and use the same, I will describeits construction in detail, referring by letter to the accompanyingdrawings, forming a part of this specification, in which- Figure 1 is aperspective showing my improvement applied to a door, the spring beingdrawn back just prior to the explosion of the cartridge; Fig. 2, asection of a portion of a door and jamb, showing my improvedburglar-alarm attached to said j amb, the operating parts being in thesame position as shown in Fig. 1; Fig. 3, an elevation of a portionof awindow, showing my improvement applied thereto; Fig. 4, a section at theline as a: of Fig. 3; Fig. 5, a plan view of the alarm, showing thespring-actuated catch forced backward to the position it will assumewhen the door or window is to be closed.

In carrying out my invention I provide a base A, which is preferablyformed from a comparativelythin sheet of metal, and from this base areformedthe two guide-strips B, which are produced by partially cuttingthe stock from the base and bending the same outward, thus formingguides for the spring C, and the rear of this spring is first passedthrough these guides and then bent outward to form the stop D, whichwill prevent the spring from being withdrawn from the guides and alsoserve as a catch by which the device is put into operative position, aswill be hereinafter explained. The inner end of the spring 0 is bentoutward to form the lug E,

and a similar lug F is secured to the spring by riveting or otherwise.

G represents the catch, the nose of which passes through the lug E andis provided with the shoulder H, adapted to abut against the lug, so asto limit the outward movement of said catch. A shank I projects rearwardfrom the catch and passes through the lug F, a spring J being interposedbetween said lug and the shoulder H, thereby normallyforcing the catchforward to the position shown in Figs. 1, 2, and 3.

K is a cartridge-holder, which consists of a strip of metal having itsedges bent upward and inward, as indicated at L, and I prefer that thisholder be riveted to the base, a c0nsiderable head M being left upon therivet so as to assist in exploding the cartridge or cap.

In applying this alarm to a door the base is secured by screws N to thedoor-jamb in such manner that the catch G extends beyond the j amb intoline with the door when the latter is being swung open, and a striker O,which consists of a thin sheet of metal bent at right angles, as clearlyshown in Fig. 2, is secured to the edge of the door, lapping over uponthe face thereof. l/Vhen the alarm is thus arranged, it is obvious thatany attempt to open the door will bring the striker in contact with thecatch,- forcing the latter outward, and with it the inner end of thespring C, until the catch slips off the striker, thereby freeing thespring, and the latter will fly inward, striking the cap or cartridgepreviously placed within the holder K and exploding the same, thusfrightening the intruder and alarming the household. The alarm may beset before the door is closed, as the closing of the door will notaffect said alarm, for as the door swings inward the striker will comeinto contact with the beveled edge of the catch G and force it backwardagainst the action of the spring J after the manner of a door-latchwithout disturbing the remainder of the alarm. This has the advantage ofpermitting the alarm to be set and the occupants of the house passingout through the door and then closing the same and yet leaving the alarmready for action should the door be tampered with. In the day and atother times when it is not desirable to have the alarm in action it isonly necessary to slide the spring backward through the guides B untilthe catch is beyond the line of the striker, after which the door may befreely opened and closed without operating the IIO alarm. Any suitablecartridge or cap may be used so long as it is adapted to be held by theholder K, and the head M of the rivet will serve as an anvil againstwhich the cap will be forced by the striking of the spring. This alarmis. equally adapted for use in connection with windows as just explainedwith a door, and when used in connection with a Window the base A issecured by the screws N to the window-sill, as shown in Fig. 3, and thestriker O is secured to the side rail of the window-frame in suchmannerthat the angle thereof projects outward in line with the catch G,and when the window is lowered the striker passes under the catch; butany attempt to raise the window will lift the catch and the springupward, finally releasing the catch and permitting the spring to flydown and explode the cap or cartridge.

Having thus fully described my invention, what I claim as new and usefulis A burglar-alarm consisting of a base,

guides formed from the base, a spring fitted to slide within the guides,the rear end of the spring being turned outward to form a stop adaptedto abut against one of the guides, gigs E and F carried by the spring, alatch fitted to slide in one of these lugs, said latch having a shankadapted to slide in the other lug, a shoulder formed upon the catch, aspring interposed between said shoulder and the rear lug, whereby thelatch is normally held in operative position, a right-angle strikeradapted to be secured to the door or window and a cartridge-holdersecured upon the base, as and for the purpose set forth.

In testimony whereof I hereunto aflix my signature in the presence oftwo subscribing witnesses.

HALLIE F. ALBURGER.

Witnesses:

MARY E. HAMER, S. S. WILLIAMSON.

